Diagnostic Routine A

Diagnostic Routine A

Diagnostic Overview

All Door Locks Are Inoperative

Refer to Wiring Diagram Set 110 for schematic and connector information Electrical Diagrams.

Normal Operations and Fault Conditions

The BCM (Body Control Module) supplies voltage to the lock all relay, the unlock driver door relay or unlock all relay based upon input from the door lock control switch or the RKE (Remote Keyless Entry) transmitters. Upon a lock request, the BCM (Body Control Module) supplies voltage on the all door lock circuit and ground on the driver and passenger door unlock circuits. Upon an unlock request, the voltage and ground are reversed on the previously listed circuits. When the door lock and unlock relays are not energized, they are connected to ground.

NOTE: The lock all, unlock driver door, and the unlock all relays are internal to the BCM (Body Control Module) and are non-serviceable.

Pinpoint Test

1. VERIFY THE DOOR LOCK OPERATION FROM THE RKE (Remote Keyless Entry) TRANSMITTER AND SWITCH

1. Press the LOCK and UNLOCK buttons on a RKE (Remote Keyless Entry) transmitter and also press the door lock control switch on the dash.

Are the door locks inoperative from the RKE (Remote Keyless Entry) transmitter and door lock control switch?






2. CHECK THE OPERATION OF THE DRIVER DOOR LOCK

1. Press the LOCK and UNLOCK buttons on a RKE (Remote Keyless Entry) transmitter while observing the driver door lock.

Does the driver door lock operate in only one direction?






3. CHECK THE LOCK CIRCUIT FOR AN OPEN

1. Disconnect: BCM (Body Control Module) C2280E.

2. Disconnect: RH (Right Hand) Front Door Latch.

3. Measure:





Is the resistance less than 3 ohms?






4. CHECK FOR CORRECT BCM (Body Control Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all BCM (Body Control Module) connectors.

3. Repair:

- corrosion (install new connectors or terminals-clean module pins)
- damaged or bent pins- install new terminals pins
- pushed-out pins- install new pins as necessary

4. Reconnect all the BCM (Body Control Module) connectors and make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?